Network Analysis

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

I have installed IP Cameras on 5 different locations in the US and I want to watch all those IP cameras in India, but the Ping Test gives me this result after having a 100 Mbps connection -> bytes= 32 time= 579 TTL=117. Because of which I am unable to watch the live view smoothly. It gets freeze after every other 2 Seconds.

I have 10mbps links between my locations and we have been experiencing network latency, primarily in the afternoons. I contacted my ISP and they were rather tight-lipped about what traffic was causing the problem. It took 8 months, countless tickets, and repeated threats to finally get the small amount of information that I have- that the primary network congestion is being caused by 4 domain controllers communicating with a domain controller in the hub of our network. I have modified the link costing and replication schedules and am pulling utilization reports tomorrow. I am going to run a packet capture with Wireshark. It is going to run from a desktop computer connected to a port that monitors the MPLS pot and filter by IP address for each of the DC’s communicating back to the hub. What should I look for in the capture that might indicate the source of what is flooding the network?

I am new to the DNS and DNS load test. Now i have task to test Load Test on two BIND9 servers [RHEL6]. I had googled it and i found dnspref is good tool to evaluate throughput and latency. However, I need a script to do this task. I will be very helpful for me if any one share the info.

I need to capture TCP/UDP packets to and from an Azure VM that is in production. I can not put Wireshark on this VM that is in production What can I do? We do own that Azure VM. We are trying to analyze why there is loss information between the VM and our hardware device.

I have 3 WS-C3550-48-SMI and they are connected to each other via 1000BaseCX Gigastack. But they are only half-duplex. My users are experiencing slow response. Could it be because of those trunks with half-duplex?

Hi we have a thousand of switches in the network. and Orion has been configured on each switches. Now we have a few of commands that need to be implemented on each of switches. How can we add these commands to each switches via Orion? Or you can send me a link for this issue. Thank you

We are thinking about upgrading our Cisco 801.11n wifi access point to Ubiquiti Unifi UAP-AC-HD Access point. We bought a test unit and very easy to setup and all in one central management robust unifi controller, we have 100m up/down internet from TWC. During our LAN speed test we are getting about 80 mb/s up and 90 down, which is normal. when we test it on the new Ubiquiti wireless access point , we are getting speed of 32-34 mbps and upload getting to 90mbps on a 5ghz band. on a 2.4ghz band we are getting about 16mbps down and 80-90mbps up. Our current network configurations example is attached. We have contacted Ubiquiti and support doesn't seem to know what went wrong still waiting for their engineer to reply. all switches are in full duplex speed. We are suspecting the firewall is filtering traffics by design, and if so, we would like to know if there is a way to fix this.

Any help in unraveling this issue would be greatly appreciated.Untitled.jpg

Hello,
I use FreeBSD ipfw, I want to measure current speed in bytes per second and packets per second for monitoring.
If I have a pipe and two queues in it, ipfw doesn't give current speed when executing 'show'. If I try to measure speed by counters (ipfw rules), I don't get real speed because counters measure queue input, some packets can be dropped in queue or pipe.
Please, help.

My sonicwall is dropping my connection from a second subnet. I understand why, as it is identifying this 96... ip address as a WAN on the LAN. However I just simply want to allow all traffic from that IP to get through. How would I go about configuring the sonicwall?

I tried disabling IP Spoof Checking from the diag.html page, but it refuses to save and only says "there were no changes made".

My train of thought was to put the Network Adapter into promiscuous mode and process packets as they come in. As I've done this previously with syslog and netflow packets, I though it would be straightforward.... NOT!

A quick search finds example code to sniff promiscuously (and there's a few out there). They all seem to use the IP header to say whether the encapsulated is TCP or UDP. This lets you filter by IP address, port etc.

The MCTS: Microsoft Exchange Server 2010 certification validates your skills in supporting the maintenance and administration of the Exchange servers in an enterprise environment. Learn everything you need to know with this course.

I have been trying to work with Sonicwall support on this issue and have made no progress. We have been using the appliance in the past with split tunnel enabled but, due to security requirements, we can no longer allow split tunnel. If we turn it off, remote users can access internal resources we have configured, but cannot access anything on the Internet. It seems that we need to create a resource which is "anything" on the Internet but we don't know how to do that. We don't see any kind of wild card options. We have not given our users access to "Any" resource. We need to specifically define the resource they have access to. We need an "Internet" resource and then we can give them access to that. Is this possible. Or, is there some other way to approach this?

Sonicwall support had us upgrade the firmware to 11.40-468 with the 708 hotfixes but that did not create an options for resolving this requirement.

hello,
i.ve scom 2016 and need to specify some service that i need to show using the visio to make dashboard. so if i need to check health of the DNS service in my 3 domains how can i do that and shall i choose. also if i need to check the status of my DHCP subnets can i do that?
i'm using visio 2013 and the scom addin installed but it's for system centre 2012 does it make any effect?
also if i need to just click on the service from the visio should it gives me the status of this object only?
thanks

Last week I tried to upgrade our edge 3750X switch (two switches in a stack), from c3750e-universalk9-mz.152-2.E.bin to c3750e-universalk9-mz.152-4.E5.bin.

Previously I copied the new IOS to both flash: and flash2: from TFTP, ran command 'boot system switch all flash:c3750e-universalk9-mz.152-4.E5.bin, and then 'wr mem'.

Later I consoled into the master switch and reloaded. The master switch booted into the new image successfully, but the member switch got stuck in a booting loop. The new IOS was loading, and went nearly to the end, and the master switch could see the member at some point. Then the process started all over again, and it was endless!

I tried powering the member switch off, and then on again - still the same. Tried removing stacking cables, and restarting - still no joy. Then booted the member into SWITCH: prompt, and then into the previous IOS - still a loop! I didn't know what else I could try, so at the end I powered the offending switch off and left it as it was (as the master switch was providing all the services).

Please could you advise how to resolve this issue? Any advice would be appreciated.

UUID is modifiable feature as many as no limited with motherboard changed . Vista II DUID with IPv6 can not be changed followed rules of NIC and IANA.

Question recreated as:
Vista II DUID ahead of dhcpv6 valid from my ISP Apr. 2014 , broadcasting to the networks, taken away authentication and rollback me as its client of "server" . ISP prolonging for treating this since 2012 with dhcpv4 only to later it having had dhpv6 . The Modem.ISP only can release an fe80:: layer IPv6 to the gateway and as dns.ipv6 by the ipcfg /all command reported.

Your writing back are expected on how to modify this and calculate the mass caused inside the complexity . Let have a valid IPv6 directly from ISP. ISP routering service not relied these years by 1996 , because the poor firewall and account Username duplicated in high/low case. While the local wireless …

I have a network of about 30 users with a 100x100 fiber connection with Spectrum. I am using a Sonicwall firewall. I did a speedtest and saw 96 down and on 6 up so I called Spectrum and they told me we were over utilized and it was extreme. My question is; how can I figure out what machine is using my bandwidth and narrow down my issue?

We suffered the slow Internet problem from yesterday, and from the Catalyst log, we saw these things:

On the Core switch at that time, the "show processes cpu" show 20% where as normally it is just 8-10%, nothing special in the Router. So can you please suggest? Is it a DoS attack? How can we avoid it on Core switch Cisco 3560?

Network Analysis

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).